I think your wrong on the ph and few things but quite a few here prefee to argue rather that explain.
I dont ph because my soil has the potential to buffer, understanding a buffer will see you ignoring tap waters ph since it is such a weak buffer.
You can see tap waters buffer just drop the ph and whatch it rise, mainly thats carbonate, ro water will fluctuate a lot more as it has but the weakest of buffers.
Tap waters carbonate buffer is used up as it reaches its ionization point at ph 4.1 and after that it will no longer rise and ph drops sharply as an acid buffer arises.
So complex i just add ferts and tap water and leave the soil to do all the ph and stuff, microbes love that crap.
Chlorine or the more modern chloramide is ultra safe for weed in all tap water, no need to remove or worry, when it hits unsafe limits for plants you will know about it cause your mouth and gut flora will probably die, it will also do a damn good job of killing mold and bacteria round the house and bathroom. Totally ignore chlorine in first world countries.
Hope that helps